----- Original Message -----
Sent: Saturday, May 22, 2004 10:30
AM
Subject: [FlyRotary] Re: Fiberglass
Help!
You probably only need 2-3 layers of BID, buy it
as sheet,
The technique I use to avoid too heavy a layup
is:
Buy some 2 mil plastic material, cut out a sheet
twice the size of your layup, fold in half, mark the shape of what you want
the finished piece to look like with felt tip marker, weigh the plastic, turn
the plastic over, lay down number of plies of BID desired, fold the plastic
over the bid (make a sandwich of plastic, cloth, plastic) weigh the
plastic/cloth combo, subtract the weight of plastic to get the weight of
cloth, mix an equal weight of epoxy and pour onto cloth. Lower the plastic
back into place, and squeegee / roll the sandwich until you can see the marker
through the sandwich. squeegee out the excess epoxy and then cut with a rotary
wheel cutter on the lines. Now you can peel off ONE side of the plastic,
carry it to your tape covered foam piece, position it, and peel off the other
side. Apply sheet peel-ply and brush it down using a hair dryer to
remove excess epoxy and let cure.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Saturday, May 22, 2004 8:51
AM
Subject: [FlyRotary] Fiberglass
Help!
Ok, you fiberglass types. I need some
guidance. I can (and have) slapped resin on glass cloth
and obtained a functional (if heavy) item. However, I am about to
start work on my new radiator ducts and I would like to
do better. My ducts will be approx. 4"x4" at the inlet and
approx. 9"x10" at the core. There might be as much as 1 psi pressure
on the walls (if I should ever be so lucky to go that fast).
There a some semi compound curves at the
corners of the duct as it slopes inward from the top and bottom from the
core to the inlet.
I need your recommendation about the weight and
weave of the cloth. I have previously used the cloth tape as it was
easy to manage, but it required several layers and it is a bit heavy.
Like I said functional but not pretty nor light.
I would like your guidance on how best to apply
the sheet to the mold. In the past, I basically wrap the foam mold in
duct tape and the lay resin on it followed by raps of the cloth tape and
more resine. I am told that using sheet rather than the tape and first
laying it out on aluminum foil to wet it and then cut it in sizes say to fit
a side of the 4 side foam mold with a bit for overlap with the adjacent
sides was one way to go.
Any suggestions would be
appreciated.
Ed
Ed Anderson
RV-6A N494BW Rotary
Powered
Matthews, NC